How to get 2 meta_value from database wp?

How to get 2 meta_value from database wp?

 global $wpdb;
    $liveaustralia = $wpdb->get_var("SELECT ok.meta_value as ok, okok.meta_value as okok FROM $wpdb->postmeta AS ok LEFT JOIN $wpdb->postmeta AS okok  WHERE post_id = '27' AND okok.meta_key = '_thumbnail_id' AND ok.meta_key = 'australian_brother'");
    echo $liveaustralia->ok;
    echo $liveaustralia->okok;

get_row ?